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Yes sweat strains the polo shirt.The deodorant/antiperspirant build up, which also causes yellow armpit stains, is likely caused by a combination of deodorant and perspiration. Many deodorants and antiperspirants contain aluminum salts. When these salts are combined with laundry detergent, especially in cooler water settings, they are not easily dissolved, and they remain on the fabric.I hope my answer will help you a lot.

The best way to stop yellowing your t shirt is to use a powder most preferably white Powder this will help control the sweat going to the shirt.Make sure you spray thoroughly before wearing your white t shirt .It can also be as a result of exercising while wearing your T- shirt.

When you are using hard water to wash your clothes white turns yellow. If your white shirts have turned yellow it is time that you use some baking soda for washing white clothes. Who wants to wear a yellow to office or school instead of the formal white.

I`m only twelves and I sweat under my arms like crazy. I feel your pain. I found it is also caused by stress mixed with puberty. As long as it doesn`t run in your family, just relax because it will be over before you know it.

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